I used to own a 66 mustang that had a DSO 89= Transportation Services I always wondered exactly what that meant. I was told these cars were used for Ford executives and some were test mules for options. Does anybody have any more info on these cars? It was pretty much a loaded car with lots of options including Disk brakes and dual exhaust automatic Trans, console. seat belt warning light and much more.
I pretty much know about the same as you on this topic. I would assume there would need to be some history/documentation that came along with the car to really know how Ford intended to use it when hit assigned that DSO number.

I am curious to learn more too.

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